Lamp



March 19, 1935.

c. scHAFFNl-:R 1,994,669

LAMP

Filed Jan. 24, 1954 n f/l 4297 i Patented Mar. 19, 1935 UNITED4s'rATifl3s PATENT- OFFICEl Charles Schaffner, Chicago, Ill.

:Application Januaryzi, 1934, serial lvfnoaois` 6 claims. v`(C1.l24o-s1) 1 The .present invention relates to lamps-and is particularlyconcerned with lighting fixtures of the=type adapted to be usedbymachine tool operators where it is `necessary to have a brilliant sourceof light applied directly to the work withput any glare in the eyes ofthe operator.

l. One of the objects of the invention is the provision of an. improvedlighting fixture for machine tool operatorslin which a shaded lamp isadapted to be adjusted and secured inany ofa plurality of rotativepositions at such a point that the light is applied directly to themachine tool work. p `Another object ofthe invention is the provision ofanimproved lamp or lighting fixture of the clasps described which isprovided with an adjust- ,able stand and improvedvertical and horizontalxtures'for facilitating the application of the light `,source `to thework. `Another object of the invention is ythe provision `of an improvedlighting 1xture of the class described in which the lamp may be veryreadily removed to be. used as a trouble lamp or for Aapplication oflight toother parts of the work apartrfrom the `lixture.

(Another object of the invention is the provision ofan improvedadjustable structure whereby the lamp supporting armis supported .onfazstandard, in-,such a way that the armrnay befrotated or moved toany -ofamultiplicity of diiferentvertical adjustments.` l

. Another object of the invention is theprovisionof:animprovedzstructure of universal support for t-heg-lamppermittingthe horizontal movementv of the lamp and its securement in anyof a plurality of rotative positions abouta vertical axis `and-alsopermittinglthe rotation ofth'e lamp abolita horizontal axis so that the`lamp has a substantial-1y universal adjustment and may be l.-a-ppliedto the work at any point and at any angle.

Other .objects and advantagesv of 'the invention be: apparent from thefollowing description and the accompanyingdrawing,-inwhich similarcharacters Yof reference indicate similar parts throughoutther severalviews.` f

Referring to the singlesheet of drawing,

.Fig. l-isa-sidefelevationalrview of a light fixture-:constructedaccording to the present invention.; p Fig, V2 is 'ahorizontalsectionalview of the `structure ofi-.the securing devices foradjustably supporting the lampfarm on-the standard, taken onftheplane'ofthe line 2 2- of Fig. 1, looking i .inthe direction ofthe arrows;

Fig. 3ds;alvertical-section taken on the plane Atheshoulders beinglprovided for preventing escape of the balls when'thes'leeve isrem'oveflfrom 21, which resiliently engagesvthe balls 27.

of the line 3=3 of Fig.v1, showing details of structure of theadjustable support for thev lamp which permits removal of the lamp foruse as a trouble lamp or adjustment of the lamp abouta horizontal or avertical axis. y 4-4``,5 A Fig. 4 is a fragmentary -top plan view of theadjustable support for the lamp of Fig. 3, taken on the plane of theline 4-4 of Fig. 1',A looking in the direction of the arrows;

Referring to Fig. 1, the lighting xtureshown `therein is indicated inits entirety by the numeral 10, and preferably comprises a-'base 11,provided with a standard 12 which carries the adjustable lampsupportingarm 13. Thebase 11 may consist of a cast metal member which is providedwith l a socket'14 adapted to xedly receive the lower end of thestandard12, which may consist'of a metallic pipe or shaft having a drive fitfinthe socketll. The base 11 maybe provided with a transverse aperture 15for receiving a lag screw 16 -to secure the base to the floor, ifdesired.

The standard 12 preferably extends to. a height well above the machinework sov that the lamp may beadjusted to anydesired height. Slidablyysupported upon the standard l2 for movement in a vertical direction isthe lamp ysupporting arm `13, which is mounted upon a metallic sleeveI7.

Sleeve 17 is a slide t with the shaft 1'2 and is preferably vformed witha pair of collars 18 and 19, with a groove l20` between the collars. The1, groove 20 and collars 18,. 19 serve to support and maintain thealignment of an arcuate' spring 21 of substantiallyrectangular shape inelevation and provided with' centrally located apertureV 22.

The sleeve 20 is provided with a threaded bore .23 `adapted toreceiveone endv o-f a threaded stud 24 upon which the spring` 2li is mounted.vThe aperture 22 is of sufficient size so that spring 211 may move inward'andoutward on the threaded Stud 24. l 1 .40

On each side of the threaded bore 23 the sleeve k1'7 is provided withapair of ball sockets 25 comprisin'gV cylindrical bores which `terminateat the tapered shoulders 26 vonthe inside of the sleeve,

the standard'12`. Balls 27'are of slightlylgreater diameter than thethickness of the sleeve 17 at fthe groove 20so that theba'lls projectoutside the sleeve into engagement with spring 21 `which i urges theballs into engagement withfthe' standard 12. i

A n'ut28vand lock` nut 29 on the threadedstud 24 are'used to placetension on the arcuate spring 55 The sleeve 17 is thus provided with afriction device for securing the sleeve in any predetermined verticalposition, and it is only necessary to move the sleeve upward anddownward, as desired, and it Will be retained in the place to which itis adjusted. The amount of friction may be regulated by means of thenuts 28 and 29.

The collars 18 and 19 are preferably provided with the bores 3Q locateddiametrically opposite the bore 23 for receiving the reduced ends 31 o-fa pair of rods 32, v33. Bores 31 are enlarged or countersunk at 32inside the sleeve 17 so that the reduced ends 31 of the rods 32, 33 maybe riveted over. The rod is thus secured to the sleeve 17 by the rivetedend of the rod and by'means of engagement of the annular shoulder34outside of the collars 18 and 19, and the rods 32,33 extend laterally ofthe sleeve 17 and parallel to each other.

The opposite ends of Athe rods 32, 33 are reduced and providedwith ends35 for receiving' a crosshead 36. C'rosshead 36 has a pair of boresforreceiving the reduced threaded ends 35 and the crosshead isconfined'between the annular shoulder 3.7 and the nut 38 on each rod.Cross- 'head 36 is also provided Vwith a centrally located horizontallyextending bore 39 for slidably receiving rod 40.

Rod 40 is providedwith a reduced end 41 which is xedly secured in albore42 in a movable crosshead 43 by riveting overthe end 44 of therod 40.yMovable crosshead 43fis confined between the riveted end 44 andtheannular shoulder 45. The movable crosshead 43 is also provided withapair of bores 46 of suitable size and location to slidably receive therods 32' and 33. The rods 32, 33 and `40 are held in parallel andsliding relation to each other. N

'In effect', the arm 13 is adjustable longitudinally for extending'or'retracting the lamp. The arm 40 is preferably provided at its oute'r end:with a flat plate or' disc 47v having a centrally located cylindricalbore 48.

Another metallic disc 49 of similar size is provided "with a threadedbore 50, into which is threaded the reduced vertical end 51 ofafcylindrical studv 52 having an annular shoulder 53. The cylindricalstud 52 rotatesin the bore 48 of `the plate 47 and is threaded aty itslower end 54 for receiving a knurled nut 55.

The helical coil spring 56 is compressed between the nut and the lowerplates 47 and 49r are brought into-frictional engagement with each otherand retained in any predetermined adjusted Arotative position.

The upper plate 49 is preferably provided. with a pair of apertures 57,each of which is countersunkj at the lower end`58 Vso thatfa pair ofmetal- `Vlic'pins 59may have their reduced'ends` 60 secured in the bore57 by riveting over at 61.

Thepins 59 each have annular shoulders 62 engagingthe upper side ofplate 49, and the pins are spaced from each other at equal distancesfrom the center' of the plate l49.

4The upper ends of the pins 59 are'preferably rounded as at 63v so as tofacilitate the insertion of the pins into a groove 64 in the lampsupportcutting the insulation of conductors 67. At its opposite end themember 65 is provided witha reduced cylindrical threaded portion 70,upon which may be threaded the usual female threaded part 71 of a lampsocket 72 of conventional shape.

The lamp socket supports the conventional type of shade 73. In thesocket is an incandescent bulb 74, which may be of the Mazda type or ofsome special type when desired. y

-A set screw -75 threaded into a bore engages the threaded hub andsecures the socket 72 in predetermined position.

At its central part the member 65 is provided with a substantiallycylindrical enlargement havradially extending flanges 76, 77. 'Iheflanges 76, 77 are provided with frusto-conical surfaces 78, 79 on theoutside and with flat surfaces 80 on the inside of a groove 64 of a sizeadapted to receive the pins' 59 and the middle cylindrical portion 81 ofthe-memberf'fis spaced sufficiently to be located 'between theipi'ns 59i,

The f1t of the pins 59 inthe groove 64 should'be such that the lamp willbe retained in anyl rotative position in which it is placed, or thpinsmay resilientlyV engage the cylindrical part Vlf'to guard againstmovement. Y' 'f''f" It will thus be observed thatfthe lampv 74lwith itsshade 73 may'move about a horizontalaxis, the yaxis of the stud 52, andit is retained ifrany adjusted position by means of the frictionalen-'gagement of the plates 47 49. -The lamp may also 'be rotated aboutfaVhorizontal axis', the ax'is'of Vtlie affording specialillumination, n

substantially rec-A tangular shape'irifsection. The groove-64is of f ingagroove, or it may be described as a pair of socket 72, by means ofAthe'felngagement Yofthfe pins 59 in the groove 64. yThelamp-maybe'pulledf out -or shoved back byfmeajnsv of the extensible feature `of thearm-"13, andthe lamp may be lifted to anyl desired position on thestandard 12s that it is locatedimmediatelyfabove thework witl'igthe'shade below the eyes of the operator. v e ff Y If desiredthe llamp\`may be" removed from Aa supporting' fixture by merely lifting themember, 65 out froml between the pins 59, -afterv'vhich/the used asatrouble lampil' lamp may be "moved to any desired position Thelamp'conductors 67, Agenerally twol in num'- Yber, andpreferably'covered-with vinsulatio'r'isuch f as rubber, preferably terminatevinthey conventionalwall'plugl 82, having the usual pair of prongs. Thetension of the springs 2-1 and56V may be changed orl adjusted so thatasthe partsfwe'ar the tension' may be increased' and the yfixture madetoretain its adjustmentas desired. n While I have illustrated apreferred embodiment of my invention, many modifications may be madeVwithout departing from the spirit -of 'the invention, andv I do notwish to be limited tothe s precise details of construction set forth,butgdesire toavail myself of all changesuwith-in the scope oftheappended claims.

Having thus described my invention, what 'I claim as new and desire tosecure by ent of the United States, is:

1.I n an operating lamp, the combination of a standardvcomprising aVbase and a vertically extending shaft with a sleeve slidably mountedvon said shaft for adjustment in a'fvertical direction, said sleevehaving a pairvof annular shoulders separated by a groove, a threadedstud mounted in Asaid groove and extending radially f 'rornfsaid sleeve,apertures onboth sides o f said stud through ewes-.1facthe sleeve andlocated in said groove, balls in said "N5 apertures, and resilient meansmounted on said stud for urging said balls into engagement with saidshaft.

2,. In an operating lamp, the combination of a standard comprising abase and a vertically extending shaft with a sleeve slidably mounted onsaid shaft for adjustment in a vertical direction, said sleeve vhaving apair of annular shoulders separated by a groove, a threaded stud mountedin said groove and extending radially from said sleeve, apertures onboth sides of said stud through the sleeve and located in said groove,balls in said apertures, resilient means mounted on said stud for urgingsaid balls into engagement with said shaft, comprising an arcuate springmember slidably mounted on said stud and guided by said annularshoulders, said stud having threaded means for engaging said spring.

3. In an operating lamp, the combination of a standard comprising a baseand a vertically extending shaft with a sleeve slidably mounted on saidshaft for adjustment in a vertical direction, said sleeve having a pairof annular shoulders separated by a groove, a threaded stud mounted insaid groove and extending radially from said sleeve, apertures on bothsides of said stud through the sleeve and located in said groove, ballsin said apertures, a lamp supporting arm carried by said sleeve, saidlamp supporting arm having means for extension of said arm, a lampcarried by the end of said arm, and a substantially universal jointconnectionbetween said lamp and said arm. s

4. In an operating lamp, the combination of a standard comprising a baseand a vertically extending shaft with `a laterally extending lampsupporting arm, said arm having a disc carried by its outer end, asecond disc in frictional en.gage ment with the first-mentioned disc,said second disc having a stud passing through an aperture in thevfirst-mentioned disc, resilient means for drawing said discs 'intofrictional engagement with each other, and a lamp carried by said seconddisc and adapted to be rotated with the second disc and held in any of aplurality of predetermined positions, said second disc having'a pair ofupwardly extending pins, and said lamp being carried by a metal sleevehaving radially extending shoulders for engaging on both sides of saidpins, whereby said lamp may be rotatably and removably supported by saidsleeve between said pins. v

5. In an operating lamp, the combination of a standard comprising a baseand a vertically ex` ing a' guide formed therein, a third rod slidably umounted in said guide and having a cross head slidably engaging saidfirst-mentioned arms.

6. In an operating lamp, the combination of a standard comprising a baseand a vertically eX- tending shaft with a sleeve slidably mounted onsaid shaft for adjustment in a vertical direction, said sleeve having apair of annular shoulders separated by a groove, a threaded stud mountedin said groove and extending radially from said sleeve, apertures onboth sides of said stud through the sleeve and located in said groove,

`balls in said apertures, resilient means mounted on said stud forurgingsaid ball-s into engagement with said shaft, and a lamp supporting armcarried by said sleeve comprising a pair of laterally extending rods, across-head carried by said rods and having a guide formed therein, athird rod slidably mounted in said guide and having a cross headslidably engaging said first-mentioned arms, a disc carried by the endof said third rod, a

ksecond disc rotatably mounted on said first-mentioned disc, a pair ofupwardly projecting pins carried by said second disc, and a lamp havinga grooved hub for receiving said pins, rotatably and removably mountedbetween said pins.v

CHARLES SCHAFFNER.

